Speed-changing device.



E. WOERNER.

SPEED CHANGING DEVICE. APPLIOATIOH- FILED MAY 20, 1910.

1,103,335 Patented July 14, 1914.

Zilll I Z I I llllll-llhlllll WITNESSES Z1 Ink/ENNIS UNITED STATES PATENT FICE,

EUGEN WOERNEB, OF

cnnns'ra'rr, onnuAN'LnssmNon. 'ro 'rnn'rmm or norm-1' BOSCH, or srur'roanr; onmtm.

SPEED-CHANGING DEVICE.

' ing the speed of rotation of a driven shaft without altering the speed of rotation of the driving shaft; or, in other words, it relates to a device for transmitting motion to, machine parts' whose speedof rotation isto be varied independently of the. speed of the driving element. For ihstance, this problem is involved in the driving of lubricating pumps which must be adjusted to various speeds for like speeds of the machine which they lubricate; otherwise they svould operate uneconomically because according to the character of the oil employed and the character of the machine itself, as well as other attendant conditions, either a moderate or a liberal lubrication is desired.

In accordance with the inventddn, the device presupposes a coupling between thedriving and the driven element, which coupling carries the driven elementalong in but one direction or rotation, and converts a re ciprocating motion of the driving element into a rotary motion of the driven element. The invention consists in providing such a coupling with 'adevice whereby it automatically throws itself out of engagement as soon as the driven element has received a predetermined stroke whose length, during the operation, can be varied at will within wide limits without changing theilength of the stroke of the drivingelement. Conse quently, inasmuch as like intervals 'oftime coincide with like numbers of strokes of the driving element, and to each stroke of the driving element (according to the adjudment of the disengaging device) there corresponds adifierent length of stroke of the driven element, it results. that for like speeds of the driving element different velocities of the driven shaft canhe obtained.

In the drawing, Figure 1 represents an end view of the coupling, partly in section,

' on a. plane indicated by the line 1-i of g 2 represents a section on the to the inner periphery of in each recess lies a clamping roll 0,

"nals for the pawls h. The springs 9 Specification of Letters Patent. Patented J uly 14 1914, Application filed Ka 20, 1910. Serial 80. 562,33,

line 2-2 of Fig. 1 of the element connected to the driven shaft; Fig.3 rep resents a section, on the line 3-3 of.Fig. 1 of the coupling element connected with the drivin element; Fig. 4 represents a side,

view 0 the main portion of the device; and 5 represents a perspective view of one of disengaging pawls.

In Figs. land 2, a is a housing which is s lined on the-shaft a to be driven. In ig. 1, the cover is cut away so'that only the cylindrical wall of the housing appears. The driving half of the coupling consists of a cylindrical readily revoluble art 15 fitting into the housing, which part upon a plate?) closing the open end of the housing, a lever-d bemg' connected tothe part b. A link e engages the lever d, said link bein adapted to be coupled to an cecentric m unted upon a rotary shaft ofthe machine, or receivmg in some other suitable manner areciprocating motion. On the pe-' riphery of the cylindrical portion 5 of the driving half of the coupling areprovided a.

number of recesses f. In the case illustrated for example, threesuch room are provided. .The tangentially arranged surfaces of the recesses f are somewhat inchned which is pressed by a spring 9 toward the narrower end of the recess.; a The springs tend, therefore, in the well known way, to couple the driving and the driven parts together.

At their openends the recesses f merge into cylindrical hores i, which serve as ourthe rolls 0 against the tails of the pawls it and thereby tend to force the noses of the pawls inwardly. If, on the other hand, the noses of the pawls are pressed outwardly against the pressure of the s rings g their tails force the clamping rol the rear part of the recesses f and release the cou ling. t

Y e disengaging device, which is shown separate in Fig. lfconsists of a round Z, in whose center is located a. cylindrical in a corresponding here in the driving element 5 of the coupling and summon the hub of the driven half not the coupling. At

the upper endof the nipple three pawls it corres ending to the three recesses it are 'provi ed, into which the noses of the pawls is mounted the housing a, and

a bee into nipple l. The nipple l is loosely revoluble engage. In the direction of the driving stroke the recesses 70 end in the bearing surfaces 70,. The disk Z is provided with a lever m, which can be rotated through an 'The mode of operation of the device is as I follows: If a reciprocating motion is imparted to the lever d by means of the link e, and if we neglect for the moment the pawls h, then the 'rolls 0 at each stroke which the lever 03 makes in'a counter clockwise direction, clamp themselves firmly between the tangentially, directed surfaces of the recesses f and the inner periphery of the housing a, and motion is imparted to the driven half ofthe coupling. At each stroke in a clockwise direction, the clamping rolls 0 roll away from the tangential surfaces of f and the driven half of the coupling remains stationary. In the rotation of the driving part I), however, the pawls h are likewise carr ed along,and, when the disengaging device Z is so adjusted that the noses f the pawls during the stroke reach the surfaces 70,, then the pawls are diverted outwardly, the r tails press'the clamping'rolls a back against the Springs 9, and thus disengage thecoupling. According to the adjustment of the disengaging device Z or of the lever m, therefore, the coupling is disengaged after a shorter or a longer working stroke, and if, for instance, it is used for driving a lubricating pump, the number of complete strokes of the pump are correspondin I in a given unit 0 time. By correspondingly adjusting the lever m, therefore, wlthout changing the speed of rotation of the drivly diminished or increased 1' 1. A device for changing a constant oscillating movement to a variable rotary motion, comprising a driving element connected to the osclllatlng member and a driven element connected to a rotatory shaft, aroller clutch interposed between said elements and effective to connect them in a single direction of oscillation, pawls pivoted on the rollercarrying member and having tails projecting into contact with the rollers, and adjustable abutments in the path of movement of the noses of the 'pawls, whereby after a predetermined length of stroke in the clutching direction the pawls are'turned on their pivots to force the rollers. out of clutching posit-ion. v p

2. A device for changing a constant oscillating movement to a variable rotary motion, comprising a driving element connected to the oscillatingmember and a driven ele" ment connected to a rotatory shaft, a roller clutch interposed between said members and elfective to connect them in a single direction of oscillation, pawls pivoted on the rollercarrying member and having tails projectingint-o contact with the rollers, and an adjustable lever arm carrying abutments in the path of movement of the noses of the pawls, whereby after a predetermined length of stroke in the clutching direction the pawls are turned on their pivots to force the rollers out of clutching position.

In testimony whereof I affix my signature, in presence of two witnesses.

v ;7EUGENJV OE-RNER. Witnesses:

MAX ANsoHfiTz,

REI HOLDELWERT. 

